Inside an Electric Razor

The batteries are bonded to the printed circuit board that also contains the charging system, the contacts for the switch and the motor controller. A printed circuit board is a thin piece of fiberglass with copper wires etched on it's surface (we also saw a PCB in the remote control we took apart).

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There is also a very tiny auxiliary PCB that holds the 2 LEDs. These LEDs indicate that the battery needs recharging, that the razor is on or that the razor is recharging.

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The business end of the razor consists of three rotating blades. The blades engage on three shafts, all of which mesh with the motor's gear in a direct-drive system.